devEval

0th

Percentile

Opens a new device, evaluate (graphing) code, and closes device

Opens a new device, evaluate (graphing) code, and closes device.

Keywords
utilities, device
Usage
devEval(type=getOption("device"), expr, envir=parent.frame(), name="Rplot", tags=NULL, ..., ext=substitute(type), filename=sprintf("%s.%s", paste(c(name, tags), collapse = ","), ext), path=getOption("devEval/args/path", "figures/"), field=NULL, onIncomplete=c("remove", "keep"), force=getOption("devEval/args/force", TRUE))
Arguments
type
Specifies the type of device to be used by devNew.
expr
The expression of graphing commands to be evaluated.
envir
The environment where expr should be evaluated.
name, tags
The fullname name of the image is specified as the name with optional comma-separated tags appended.
ext
The filename extension of the image file generated, if any. By default, it is inferred from argument type.
...
Additional arguments passed to devNew.
filename
path
The directory where then image should be saved, if any.
field
An optional character string specifying a specific field of the named result list to be returned.
onIncomplete
A character string specifying what to do with an image file that was incompletely generated due to an interrupt or an error.
force
If TRUE, and the image file already exists, then it is overwritten, otherwise not.
Value

• Returns a named list with items specifying for instance the pathname, the fullname etc of the generated image. If argument field is given, then the value of the corresponding element is returned. Note that the return value may be changed in future releases.

Generated image file

If created, the generated image file is saved in the directory specfied by argument path with a filename consisting of the name followed by optional comma-separated tags and a filename extension given by argument ext. By default, the image file is only created if the expr is evaluated completely. If it is, for instance, interrupted by the user or due to an error, then any incomplete/blank image file that was created will be removed. This behavior can be turned of using argument onIncomplete.

To change default device parameters such as the width or the height, devOptions(). devNew().

• devEval
Examples
res <- devEval("png", name="MyPlot", tags=c("10", "rnd"), aspectRatio=0.7, {
plot(1:10)
})
print(res$pathname) # [1] "figures/MyPlot,10,rnd.png" res <- devEval("pdf", name="MyPlot", tags=c("10", "rnd"), aspectRatio=0.7, { plot(1:10) }) print(res$pathname)
# [1] "figures/MyPlot,10,rnd.pdf"

res <- devEval("eps", name="MyPlot", tags=c("10", "rnd"), aspectRatio=0.7, {
plot(1:10)
})
print(res\$pathname)
# [1] "figures/MyPlot,10,rnd.eps"
Documentation reproduced from package R.utils, version 1.12.0, License: LGPL (>= 2.1)

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